package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.result.Result;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;


@Service
@Slf4j
public class ShoppingCartServicelmpl implements ShoppingCartService {


    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO){

       //判断当前购物车中的商品是否存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);


        //存在，商品数量加一
        if(list != null && list.size() > 0){

            ShoppingCart cart = list.get(0);//获取查询到的一条数据
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);

        }else{
            //不存在，直接插入
             Long dishId = shoppingCartDTO.getDishId();//获取菜品id
            if(dishId !=null){
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setImage(dish.getImage());

            }else{
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setImage(setmeal.getImage());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
   }


    /**
     * 查看购物车
     * @return
     */
   public List<ShoppingCart> showShoppingCart(){


        //更具用户id查询购物车
       long userId = BaseContext.getCurrentId();
       ShoppingCart shoppingCart = ShoppingCart.builder()
                       .userId(userId)
                       .build();
       List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
       return list;


   }

    /**
     * 清空购物车
     */
   public void cleanShoppingCart(){
       long userId = BaseContext.getCurrentId();
       shoppingCartMapper.deleteByUserId(userId);
   }


    /**
     * 删除购物车中的一个商品
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO){

        //判断购物中的商品数量是否为1，等于1则需要删除该商品的记录，若大于1，则修改数量即可；

        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);//获取查询到的一条数据
            Integer number = cart.getNumber();
            if(number==1){
                shoppingCartMapper.deleteById(cart.getId());//根据id删除购物车，不能根据用户id，否者全删除了

            }else{

                cart.setNumber(number-1);
                shoppingCartMapper.updateNumberById(cart);

            }


        }


    }








}
